Sanding machine



March l, 1932. R. D, EAGLESFHELD 1,847,299

SANDING MACHINE Filed July 12, 1930 2 Sheets-sheet i fava/:4%.

A TTORNEY March l, 1932; R, D. EAGLESFIELD 1,847,299

SANDING MACHINE Filed July l2, 1930 2 Sheets-Sheet 2 A TTORNE Y Patented Mar. 1, 1 932 UNIT1511) STATES PATENT OFFICE i ROBERT n. EAGLESFIELD, `or .INDIANAPOLISKINDIANA ASSIGNOR, BY MESNE ASSIGN Y MENTSTO UNION SANDPAPER COMPANY, or BOSTON, MASSACHUSETTS, A coBPoRA- TI'oN )or MASSACHUSETTS ASANDINGL MACHINE "Application ned July 12, 1930. "Senn No. 467,415.

AThis invention relates to asanding roll. The chief obj ect of the invention is to-produce a Lsanding roll whichwill be truly cylin- `dricall in cross section, whereby iats and 'other .5 deformations heretofore obtained in Sanding rolils are eliminated.

The chief feature of the invention consists in ithe accomplishment of the foregoing `object by the formation of `an endless tubular i0 sanding-surface and the mounting thereof upon a' Supporting cylinder for forming `a trulycylindrical roll. i

. Another feature of the invention consists inthe formation of the cylindrical support :.15 in such a manner that the tubularendless sanding surface may be kreadily mounted upon a portion of the cylindrical support and v.thereafter positioned in v truly cylindrical form and supported therein by the remain- 20 der of the cylindrical .support forming parts. i

kcylindrical roll which maintains a uniform sanding action and does not produce Waves A further feature of the invention .convvs-ists in the automatic looking together ofthe vrelatively movable parts constituting the cylindrical support.

. '25 The full nature of the invention will be V35 and' ofthe roll in its completed forni. Fig. 4;

is :a .view similar to Fig. 3 but with the lroll 1in incomplete formation showing .one step fin the formation ofthe roll. Fig. 5 Avisa'top plan View of the roll support with the sanding 40 fsurface and intermediate Supporting'inedium removed. Fig. `6 is a perspectiveview of the endless tubular sanding surface. Fig. 7 -is la perspective viewof one of the detachable segments. v a

In Fig. 1 there is conventionally illustrated 1a power Sanding machine including the side Vframes 10, a table or work vsupporting ele- -ment 11 .and a'power source or motory 12 Pwhich through the endles belts 13,` 14 yand 15 "mfeeds the work:r 116 through the machine sandpaper or they like formed by suitable lapftary movement of the cylinder.

through the'medium lof .the feeding rolls 17, and sands said work through the medium of the Sanding rolls 18.- Intermediate driving connections 19 are associated with the belt 16 andthefeeding krolls 17'. 1 Idler rolls 20 are associated with the sanding rolls 18 and the lendless'driving belt 14. v

Heretofore the sanding rolls which may lbe employed in machines of the'aforesaid character, or in .any other suitable machine, comprised parted or split substantially cylindrical rolls over which asheet of sand' paper `ror thel like was laid, having two free lends clamped in place. When thesame `was locked vtogether the sanding surface was thereby I .anchored to the supporting rol-l. However,

such a construction was not truly cylindrical and therefore flats were-developed which left undesirable waves on the sanded surface.

'The presen-t invention employs a truly l) inthe work when sanded. The vinventioncon- Sists 1n .the provision of an endless tubular I6 i ing or splicing'or otherwise securing ofthe '.two adjacent edges thereof into tubular formation with the joint 22 fof an indistinguishable character, reference Vbeingihad not to observation of the joint but to the effect of 1o said joint upon the work when sanded there- The'sanding .cylinder for supporting the tubular sanding surface 21 comprises a recessed cylinder 23 having the stub shafts 24, f5 which'is 'provided with a plurality of long-itudinally extending undercut recesses 2 5 equally spaced about its "periphery, there Ibeing shown herein three of such recesses. 'The recesses are tapered from one end to the-other l) while being 'of constant depth from end to end. The cylindrical surface portions 26 of the recessed cylinder are only maintained intermediate the grooves 25 for the length thereof. As Shown in Fig. 4, the grooves are U undercut as indicated at'27 so as to coac't with the segments mounted therein for retaining them in interlocking position against displacement Eby the centrifugal force dueto ro- Slidably mounted in each of the recesses 25 there is a segment 29 so formed as to be slidable therein from the enlarged end and fit snugly in Wedging position. Corresponding With the formation of the recesses, the segmentsare tapered from end to end, having the sides 31 thereof extending outwardly to conform and interlock With the undercut sides 27 of the grooves 25.

' Thus after thel tubular sand paperhas been mounted over the roll as Will be'hereinafter described and the segments 29 are mounted in position, they Will be loclred in place by the dove-tail undercut formation against displacement by centrifugal force, Aand will be held by the vvvedging action against dislodgment longitudinally.

In the present invention there is also employed an endless tubular cushion support 33 which is of feltmaterial. 'Ihev formation of the Atruly cylindrical sanding vroll is as follovvs: The endless tubular feit or cushionis positioned Within the endless tubular sanding surface or sand paper roll and the same then are telescopically mounted over the-cylinder 23; This is shown in Fig. 4 and it Will be noted from said figure that the portions Which are positioned immediately opposite the groove and cover the same extend chordlike directly across the groove. After thus positioning the sand paper tube, the several segments 29 are inserted in the mouth of the grooves 25 and are driven home.

It will be understood that there is no substantial stretching or expansion of the endless tubular felt or sand paper, for the cylindrical supporting surface is constant and uniform, all of the Wedging being in other directions. The mounting of the segments accom- .plishes -the elimination ofslaclr in the sandpaper tube and forms it into trulycylindrical form. o

If desired, clamping rings 34 having the clamping ears 35 and clamping means 36, including bolt and nut, may be associated With the ends of the `rolls to prevent longitudinal relative movement.

One of the stub shafts 24 is extended and carries a driving pulley driven by the belt 14. Said shaft is detachable from the pulley by the axial relative movement therebetween, and a guide or support 37 supports ball bear- .ings 38 which rotatably support the shaft 24. The opposite end of the roller through the stub shaft 24 is associated With the ball bearings 39, the same being receivable by a recess 40 formed in an arm 41 constituting a shaft support. Said arm 4l is longitudinally movable with respect to the roll for roll demounting. Herein such possible movement is shown by the shaft support 4l being hingedly supported at 42 and being locked in shaft supporting position by suitable means 43.

YIlVhen the lock or retainer 43 is disconnected, Y

the sha-ft support 4l maybe tilted andthe forming with the surface of said drum in order to permit' a loose mounting 'ofthe sanding tube on the drum and the completion of the mountingV by insertion of the segments to provide uniform support under the enire cylindrical surface of the sanding tu e. v Y

2. In a sanding roll, the combination With an endless cylindrical sanding tube, of a support therefor comprising a drum having a plurality of longitudinal grooves extending from end to end thereof for permitting said tube to be readily mountedthereover, and a plurality of segmental members adapted to slide into said grooves from one end thereof` and having their exposed surfaces conforming to the cylindrical vsurface of said drum for filling out said tube and supporting the same uniformly under the entire surface thereof.

3. In a sanding roll, the combination with an endlessV cylindrical sanding tube, of a, support therefor comprising a drum having .a plurality of grooves formed. therein extending and tapered from one end to the other overwvhich said tube is adapted to be mounted so as to extend chord-like across Vsaid grooves engaging thearcuate cylindrical surfaces thereof, and a plurality of segmental members' tapering from one end to the other adapted to be mounted in Vsaid grooves from one end thereof so as to Wedge lagainst the sides thereof, the exposed sursupport therefor comprising a drum having a plurality of longitudinally extending grooves formedV in the surface thereof, said grooves having their sides undercut, and a plurality of segmental members adapted to .be slidablymounted in said grooves from one end thereof after said tube has been mounted thereon, said members having their side surfaces so formed as to dove-tail in said grooves Vand interlock therewith and'their exposed surfaces conforming to the surface of said drum so as to provide a cylindrical periphery vtherefor for supporting said tube.

5. A sanding roll comprising a cylindrical sanding tube and a rotary support therefor, said support comprising a tubular cushion positioned Within the sanding tube andv a massive driving drum within the cushion, said driving drum having a hub portion and a plurality of rigidly connected spokes which Hare outwardly from the hub to provide portions o a cylindrical surface on which the cushion and belt may be loosely tted, said rotary support being also provided with complementary locking members which have a taper fit between the spokes and which have outer areas complementary to the outer areas of the spokes, whereby the locking members may be introduced between the spokes and the cushion to provide along with the spokes complete cylindrical support under the cushion and sanding belt.

ROBERT D. EAGLESFIELD. 

